Assembly for monitoring ionising radiation

An assembly for the monitoring of ionising radiation which comprises coated on a base a layer which has been formed by drying down an aqueous emulsion of a binder having incorporated therein an organic solvent solution of a polychlorinated hydrocarbon and a solution or dispersion of at least one colour former of the general formula ##STR12## wherein Y represents an amino-substituted phenyl radical of the formula ##STR13## or an indolyl radical of the formula ##STR14## in which formulae each of X.sub.1 and X.sub.2 independently represent hydrogen, alkyl of 1 to 12 carbon atoms which is unsubstituted or substituted by halogen, hydroxyl, cyano, phenyl or lower alkoxy;

• cycloalkyl, phenyl, benzyl, or phenyl or benzyl which is substituted by halogen, lower alkyl or lower alkoxy, or
• X.sub.1 and X.sub.2 together with the nitrogen atom to which they are attached represent a 5- or 6-membered, preferably saturated, heterocyclic radical,
• X.sub.3 represents hydrogen, halogen, nitro, lower alkyl or lower alkoxy, these alkyl and alkoxy groups being unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, acyl of 1 to 12 carbon atoms, phenyl, benzyl, or phenyl or benzyl which is substituted by halogen, lower alkyl, lower alkoxy or nitro, and
• Z.sub.2 represents hydrogen, lower alkyl or phenyl and the rings A, B and D independently can be further substituted by cyano, nitro, halogen, lower alkyl, lower alkoxy or lower alkylcarbonyl,
• or of the general formula ##STR15## where each of R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are alkyl, aryl or aralkyl, and each of X.sub.1, X.sub.2, X.sub.3, X.sub.4, X.sub.5 and X.sub.6 are hydrogen, alkyl, alkoxy, aryl or aralkyl,
• or of the general formula ##STR16## wherein the ring A represents a fused-on optionally substituted benzene, naphthalene or heterocyclic ring, in particular a pyridine or quinoline ring, R.sub.2 and R.sub.2.sup.1 each represents hydrogen or lower alkyl or an aryl radical, preferably a radical of the benzene series, R.sub.3 and R.sub.3.sup.1 each represent hydrogen or a lower alkyl or alkoxy group and R.sub.1 and R.sub.1.sup.1 each represents hydrogen or preferably, an aralkyl radical or an optionally substituted alkyl or alkenyl radical, other than an aralkyl radical, with 1 to 18 and 3 to 18 carbon atoms respectively,
• or of the general formula ##STR17## wherein R is a piperidino group, a pyrrolidino group, a morpholino group, an N-lower alkyl-cyclohexylamino group or an N-benzylcyclohexylamino group, R.sub.1 is a hydrogen atom, a lower alkyl group, a substituted or unsubstituted amino group or a halogen atom, R.sub.2 is a hydrogen atom, a lower alkyl group, a lower alkoxy group or a halogen atom, R.sub.3 is a hydrogen atom, a C.sub.1-8 alkyl group, a phenyl group, a piperidino group, a methylpiperidino group, a pyrrolidino group, a morpholino group, a group of the formula ##STR18## where X represents a hydrogen atom, an acyl group, a lower alkyl group, a benzyl group, a cyclohexyl group or a substituted or unsubstituted aryl group;
• and Y represents a hydrogen atom, an alkyl group or a substituted or unsubstituted benzyl group, a halogen atom, an alkoxy group or a substituted or unsubstituted diphenylmethylamino group;
• R.sub.4 is a hydrogen atom, a lower alkyl group or a alkoxy group, provided that R.sub.1 and R.sub.2, R.sub.3 and R.sub.4 may be groups represented by the formula --CH.dbd.CH--CH.dbd.CH--, and, in this case, the naphthalene ring may have a halogen atom or a substituted or unsubstituted amino group, and the benzene ring C may have 1 to 4 halogen atoms, provided that when R is piperidino, pyrrolidino, morpholino, cyclohexylamino or N-methylcyclohexylamino, at least one of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is a substituent other than hydroge, lower alkyl and halogen.